The Role of Multiwall Carbon Nanotubes in Cu‐BTC Metal‐Organic Frameworks for CO₂ Adsorption

Abstract

The discovery of natural gas fields with a high content of CO2 in world gas reservoirs poses new challenges for CO2 capture. This work investigates the use of the metal‐organic framework (MOF) Cu‐BTC and hybrid MWCNTs@Cu‐BTC for CO2 adsorption. Cu‐BTC and hybrid MWCNTs@Cu‐BTC were synthesized by the solvothermal method. The results of imaging of intact MOF pores in Cu‐BTC and hybrid MWCNTs@Cu‐BTC nanocrystals by high‐resolution transmission electron microscopy (HRTEM) under liquid nitrogen conditions are presented. Physical characterizations of the solid adsorbents were made by using a selection of different techniques, including field‐emission scanning electron microscopy (FESEM), X‐ray powder diffraction (XRD), Fourier transform infrared (FT‐IR) spectroscopy, thermogravimetric analysis (TGA), Brunauer–Emmet–Teller (BET) surface area, and CO2 adsorption and physisorption measurements. HRTEM and FESEM confirmed that Cu‐BTC has an octahedral shape and that the surface morphology of Cu‐BTC changes by the intercalation of MWCTNs. The results show that the modified Cu‐BTC improved the CO2 adsorption compared to pure Cu‐BTC. The increase in the CO2 uptake capabilities of hybrid MWCNTs@Cu‐BTC was ascribed to the intercalation of MWCNTs with Cu‐BTC crystals. The CO2 sorption capacities of Cu‐BTC and hybrid MWCNTs@Cu‐BTC were found to increase from 1.91701 to 3.25642 mmol/g at ambient conditions.

Enhancing photocatalytic activity of titanium dioxide through incorporation of MIL‐53(Fe) toward degradation of organic dye

“…[17,18] Here, we demonstrate the incorporation of a metal-organic framework (MOF) as well as a calcined product of the MOF to modify surface-active sites of TiO 2 for a better photocatalytic activity. [21][22][23][24][25] MIL-53(Fe), in particular, is a promising MOF for the removal of organic pollutants due to its good absorption property as well as responses to the UV-Vis region, which are at a lower bandgap energy (2.88 eV). [19,20] To date, MOFs have displayed various properties, for instance gas adsorption, adsorption of organic and inorganic pollutants, sensing, separations, catalysis, photocatalysis, and drug delivery.…”

High‐temperature CO2 removal from CH4 using silica membrane: experimental and neural network modeling

“…Nowadays, the most demanding gas treatment function is the removal of CO 2 from natural gas streams and flue gas streams . Some natural gas contains a high percentage of CO 2, which usually falls in the range of 65–70%, and some are as high as about 80% . Natural gas can entail only below 2–3% of CO 2 according to pipeline specification .…”

“…1,2 Some natural gas contains a high percentage of CO 2, which usually falls in the range of 65-70%, and some are as high as about 80%. [3][4][5][6][7] Natural gas can entail only below 2-3% of CO 2 according to pipeline specification. 8,9 CO 2 can react with water to form carbonic acid, which is highly corrosive.…”

Experimental and Neural Network Modeling of Partial Uptake for a Carbon Dioxide/Methane/Water Ternary Mixture on 13X Zeolite

“…Even with the wide range of utilization in this field, there is still a lack of information on the characteristic behavior of CO 2 adsorption in multicomponent mixtures. There are no detailed studies for comparison between these types of commercial adsorbents, which are still pioneering materials for CO 2 removal, related to their partial component uptake performances for a wide range of mixture combinations and conditions.…”

“…Most of the studies on the separationo fC O 2 concerned new adsorbents such as metal-organic frameworks (MOFs), [29][30][31][32][33][34] N-doped porous carbons (NPCs), [35] microporous coordination polymers (MCPs), [36] covalento rganic polymers (COPs), [37][38][39] and porous organic polymers (POPs) [40][41][42] compared to commercial adsorbents (i.e., molecular sieves,a ctivated carbons,a nd silica gel) [43][44][45][46] and relied on theoretical selectivity analysis.E ven with the wide range of utilization in this field, there is still al ack of information on the characteristic behavior of CO 2 adsorption in multicomponent mixtures.T here are no detailed studies for comparison between these types of commercial adsorbents, which are still pioneering materials for CO 2 removal, [47][48][49] related to their partialc omponent uptake performances for awide range of mixturec ombinations and conditions. Molecular sieve zeolite (MSZ) adsorbents are one of the most popular solid adsorbents utilizedn ormally for the separation and purification of multicomponent mixtures.T hese adsorbents have low Si/Al ratios (e.g.,1 3X and 5A zeolite), which results in higher uptake amounts of CO 2 at low pressures ( % 2.5 mmol g À1 at 298 Ka nd 0.1 bar).…”